import arcpy

testabc = r"in_memorytestabc"
myTable = "mytable"
in_memory = "in_memory"

output = arcpy.TableToTable_conversion(myTable, in_memory, "testabc", "", "", "")

arcpy.SetParameter(0, output)

import arcpy

mxd = arcpy.mapping.MapDocument("CURRENT")
df = mxd.activeDataFrame

testabc = r"in_memorytestabc"
myTable = "mytable"
in_memory = "in_memory"

arcpy.TableToTable_conversion(myTable, in_memory, "testabc", "", "", "")

mytableview = arcpy.mapping.TableView(testabc)
arcpy.mapping.AddTableView(df, mytableview)

arcpy.RefreshTOC()